I don't know anything about Kurzweil, I've never seen an arranger from them.

I'm not surprised at all by your post and I agree. I could tell right away from the manual and video demos that the Roland E-X20 and E-X30 weren't designed by Roland. IMO they're far inferior to Roland's prior entry-level efforts like the EXR- and EM- series.

I hope this doesn't mean that Roland has given up on the arranger market, but I fear it might be true.